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After the pixel block width and height, a third field is used to store the pixel block depth. Document this field. Signed-off-by: Simon Ser <contact@emersion.fr> Reviewed-by: Marek Olšák <marek.olsak@amd.com> Acked-by: Leo Liu <leo.liu@amd.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10134>